QwtAbstractScale(3) Qwt User's Guide QwtAbstractScale(3) NAME QwtAbstractScale - An abstract base class for widgets having a scale. SYNOPSIS #include Inherits QWidget. Inherited by QwtAbstractSlider, and QwtThermo. Public Member Functions QwtAbstractScale (QWidget *parent=NULL) virtual ~QwtAbstractScale () Destructor. void setScale (double lowerBound, double upperBound) Specify a scale. void setScale (const QwtInterval &) Specify a scale. void setScale (const QwtScaleDiv &) Specify a scale. const QwtScaleDiv & scaleDiv () const void setLowerBound (double value) double lowerBound () const void setUpperBound (double value) double upperBound () const void setScaleStepSize (double stepSize) Set the step size used for calculating a scale division. double scaleStepSize () const void setScaleMaxMajor (int ticks) Set the maximum number of major tick intervals. int scaleMaxMinor () const void setScaleMaxMinor (int ticks) Set the maximum number of minor tick intervals. int scaleMaxMajor () const void setScaleEngine (QwtScaleEngine *) Set a scale engine. const QwtScaleEngine * scaleEngine () const QwtScaleEngine * scaleEngine () int transform (double) const double invTransform (int) const bool isInverted () const double minimum () const double maximum () const const QwtScaleMap & scaleMap () const Protected Member Functions virtual void changeEvent (QEvent *) override void rescale (double lowerBound, double upperBound, double stepSize) void setAbstractScaleDraw (QwtAbstractScaleDraw *) Set a scale draw. const QwtAbstractScaleDraw * abstractScaleDraw () const QwtAbstractScaleDraw * abstractScaleDraw () void updateScaleDraw () virtual void scaleChange () Notify changed scale. Detailed Description An abstract base class for widgets having a scale. The scale of an QwtAbstractScale is determined by a QwtScaleDiv definition, that contains the boundaries and the ticks of the scale. The scale is painted using a QwtScaleDraw object. The scale division might be assigned explicitly - but usually it is calculated from the boundaries using a QwtScaleEngine. The scale engine also decides the type of transformation of the scale ( linear, logarithmic ... ). Definition at line 36 of file qwt_abstract_scale.h. Constructor & Destructor Documentation QwtAbstractScale::QwtAbstractScale (QWidget * parent = NULL) [explicit] Constructor Parameters parent Parent widget Creates a default QwtScaleDraw and a QwtLinearScaleEngine. The initial scale boundaries are set to [ 0.0, 100.0 ] The scaleStepSize() is initialized to 0.0, scaleMaxMajor() to 5 and scaleMaxMajor to 3. Definition at line 57 of file qwt_abstract_scale.cpp. Member Function Documentation QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw () [protected] Returns Scale draw See also setAbstractScaleDraw() Definition at line 293 of file qwt_abstract_scale.cpp. const QwtAbstractScaleDraw * QwtAbstractScale::abstractScaleDraw () const [protected] Returns Scale draw See also setAbstractScaleDraw() Definition at line 302 of file qwt_abstract_scale.cpp. void QwtAbstractScale::changeEvent (QEvent * event) [override], [protected], [virtual] Change Event handler Parameters event Change event Invalidates internal caches if necessary Reimplemented in QwtThermo, QwtSlider, QwtKnob, and QwtDial. Definition at line 453 of file qwt_abstract_scale.cpp. double QwtAbstractScale::invTransform (int value) const Translate a widget coordinate into a scale value Parameters value Widget coordinate Returns Corresponding scale coordinate for value See also scaleMap(), transform() Definition at line 381 of file qwt_abstract_scale.cpp. bool QwtAbstractScale::isInverted () const Returns True, when the scale is increasing in opposite direction to the widget coordinates Definition at line 390 of file qwt_abstract_scale.cpp. double QwtAbstractScale::lowerBound () const Returns Lower bound of the scale See also setLowerBound(), setScale(), upperBound() Definition at line 88 of file qwt_abstract_scale.cpp. double QwtAbstractScale::maximum () const Returns The boundary with the larger value See also minimum(), lowerBound(), upperBound() Definition at line 409 of file qwt_abstract_scale.cpp. double QwtAbstractScale::minimum () const Returns The boundary with the smaller value See also maximum(), lowerBound(), upperBound() Definition at line 399 of file qwt_abstract_scale.cpp. void QwtAbstractScale::rescale (double lowerBound, double upperBound, double stepSize) [protected] Recalculate the scale division and update the scale. Parameters lowerBound Lower limit of the scale interval upperBound Upper limit of the scale interval stepSize Major step size See also scaleChange() Definition at line 429 of file qwt_abstract_scale.cpp. const QwtScaleDiv & QwtAbstractScale::scaleDiv () const Returns Scale boundaries and positions of the ticks The scale division might have been assigned explicitly or calculated implicitly by rescale(). Definition at line 349 of file qwt_abstract_scale.cpp. QwtScaleEngine * QwtAbstractScale::scaleEngine () Returns Scale engine See also setScaleEngine() Definition at line 338 of file qwt_abstract_scale.cpp. const QwtScaleEngine * QwtAbstractScale::scaleEngine () const Returns Scale engine See also setScaleEngine() Definition at line 329 of file qwt_abstract_scale.cpp. const QwtScaleMap & QwtAbstractScale::scaleMap () const Returns Map to translate between scale and widget coordinates Definition at line 357 of file qwt_abstract_scale.cpp. int QwtAbstractScale::scaleMaxMajor () const Returns Maximal number of major tick intervals See also setScaleMaxMajor(), scaleMaxMinor() Definition at line 202 of file qwt_abstract_scale.cpp. int QwtAbstractScale::scaleMaxMinor () const Returns Maximal number of minor tick intervals See also setScaleMaxMinor(), scaleMaxMajor() Definition at line 232 of file qwt_abstract_scale.cpp. double QwtAbstractScale::scaleStepSize () const Returns Hint for the step size of the scale See also setScaleStepSize(), QwtScaleEngine::divideScale() Definition at line 264 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setAbstractScaleDraw (QwtAbstractScaleDraw * scaleDraw) [protected] Set a scale draw. scaleDraw has to be created with new and will be deleted in the destructor or the next call of setAbstractScaleDraw(). See also abstractScaleDraw() Definition at line 277 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setLowerBound (double value) Set the lower bound of the scale Parameters value Lower bound See also lowerBound(), setScale(), setUpperBound() Note For inverted scales the lower bound is greater than the upper bound Definition at line 79 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScale (const QwtInterval & interval) Specify a scale. Define a scale by an interval The ticks are calculated using scaleMaxMinor(), scaleMaxMajor() and scaleStepSize(). Parameters interval Interval Definition at line 145 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScale (const QwtScaleDiv & scaleDiv) Specify a scale. scaleMaxMinor(), scaleMaxMajor() and scaleStepSize() and have no effect. Parameters scaleDiv Scale division See also setAutoScale() Definition at line 158 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScale (double lowerBound, double upperBound) Specify a scale. Define a scale by an interval The ticks are calculated using scaleMaxMinor(), scaleMaxMajor() and scaleStepSize(). Parameters lowerBound lower limit of the scale interval upperBound upper limit of the scale interval Note For inverted scales the lower bound is greater than the upper bound Definition at line 130 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScaleEngine (QwtScaleEngine * scaleEngine) Set a scale engine. The scale engine is responsible for calculating the scale division and provides a transformation between scale and widget coordinates. scaleEngine has to be created with new and will be deleted in the destructor or the next call of setScaleEngine. Definition at line 316 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScaleMaxMajor (int ticks) Set the maximum number of major tick intervals. The scale's major ticks are calculated automatically such that the number of major intervals does not exceed ticks. The default value is 5. Parameters ticks Maximal number of major ticks. See also scaleMaxMajor(), setScaleMaxMinor(), setScaleStepSize(), QwtScaleEngine::divideInterval() Definition at line 189 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScaleMaxMinor (int ticks) Set the maximum number of minor tick intervals. The scale's minor ticks are calculated automatically such that the number of minor intervals does not exceed ticks. The default value is 3. Parameters ticks Maximal number of minor ticks. See also scaleMaxMajor(), setScaleMaxMinor(), setScaleStepSize(), QwtScaleEngine::divideInterval() Definition at line 219 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setScaleStepSize (double stepSize) Set the step size used for calculating a scale division. The step size is hint for calculating the intervals for the major ticks of the scale. A value of 0.0 is interpreted as no hint. Parameters stepSize Hint for the step size of the scale See also scaleStepSize(), QwtScaleEngine::divideScale() Note Position and distance between the major ticks also depends on scaleMaxMajor(). Definition at line 251 of file qwt_abstract_scale.cpp. void QwtAbstractScale::setUpperBound (double value) Set the upper bound of the scale Parameters value Upper bound See also upperBound(), setScale(), setLowerBound() Note For inverted scales the lower bound is greater than the upper bound Definition at line 102 of file qwt_abstract_scale.cpp. int QwtAbstractScale::transform (double value) const Translate a scale value into a widget coordinate Parameters value Scale value Returns Corresponding widget coordinate for value See also scaleMap(), invTransform() Definition at line 369 of file qwt_abstract_scale.cpp. void QwtAbstractScale::updateScaleDraw () [protected] Recalculate ticks and scale boundaries. Definition at line 466 of file qwt_abstract_scale.cpp. double QwtAbstractScale::upperBound () const Returns Upper bound of the scale See also setUpperBound(), setScale(), lowerBound() Definition at line 111 of file qwt_abstract_scale.cpp. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.2.0 Sun Jul 18 2021 QwtAbstractScale(3)